ESPHome boot_on

Hello Friends!!
I`ve tried to turn backlight of LCD2004 off when esp32 boot up, but it refuses to obey. When i use touchPin for turn backlight off it works fine. Please look at code and help if possible.

esphome:
  name: greenhouse-controller
  friendly_name: greenhouse _controller
  on_boot:
    priority: 600
    then:
      script.execute: backlight_off   

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: ""

ota:
  password: ""

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Greenhouse-Controller"
    password: "cN6lTpQcO8"

captive_portal:
  
web_server:
  port: 80   

i2c:
  sda: 21
  scl: 22
  scan: True   

sensor:
  - platform: bme280
    temperature:
      id: "t1"
      name: "BME280 Temperature"
      oversampling: 16x
    pressure:
      id: "p1"
      name: "BME280 Pressure"
    humidity:
      id: "h1"    
      name: "BME280 Humidity"
    address: 0x76
    update_interval: 60s 

time:
- platform: homeassistant
  id: my_time

display:
  - platform: lcd_pcf8574
    id: mydisplay
    user_characters:
    - position: 0
      data:
        - 0b01100
        - 0b10010
        - 0b10010
        - 0b01100
        - 0b00000
        - 0b00000
        - 0b00000
        - 0b00000
    dimensions: 20x4
    address: 0x3F
    lambda: |-
      it.strftime("%H:%M on %d.%m.%Y", id(my_time).now());
      it.printf(0, 1,"Temperature: %1.0f", id(t1).state);
      it.print(15, 1,"\x08");
      it.print(16, 1,"C");
      it.printf(0, 2,"Humidity: %1.0f", id(h1).state);
      it.print(13, 2,"%");
      it.printf(0, 3,"Pressure: %1.0f mmHg", id(p1).state*0.7500637);

esp32_touch:
  setup_mode: false

binary_sensor:
  - platform: esp32_touch
    name: "Touch15"
    pin: GPIO15
    threshold: 1000
    on_press:
      then:
        - binary_sensor.template.publish:
            id: backlight
            state: ON
        - binary_sensor.template.publish:
            id: backlight
            state: OFF
  - platform: template
    id: backlight
    filters:
      - delayed_off: 10s
    on_press:
      then:
        - lambda: |-
            id(mydisplay).backlight();
    on_release:
      then:
        - lambda: |-
            id(mydisplay).no_backlight();    

switch:
  - platform: gpio
    pin: GPIO16 
    name: "outside_path_light16"     

script:
  - id: backlight_off
    then:
    - lambda: |-
        id(mydisplay).no_backlight();

Sorry for disturb. my bad. just need to make priority lower.